On some of the longer threads which get over run by place markers and troll hunters, it seems to me that it would be useful to just filter to show the OP's posts sometimes.
I have highlight colours switch on for the OP etc, but on a thread running to 800+ posts, it would be nice to just show the 4/5 posts by the OP easily, rather than having to scroll through multiple pages of place marking fun. I know the whole thread can be loaded, but I'm most often on a slightly older device which doesn't like showing longer threads all on one page.